Franklin Parish, LA Insulation Payback
Franklin Parish, LA: what topping up your attic actually costs
Franklin Parish sits in IECC climate zone 3 (Hot-Humid) — humid heat for much of the year, with cooling running far more than heating ever does. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-49. For an attic around 1,000 square feet, closing the gap from R-2 to R-49 costs around $2,820 and saves an estimated $992 a year — payback in roughly 2.8 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $582/year heating, $410/year cooling. Out of every 100 US counties tracked here, Franklin Parish's savings potential beats roughly 16 of them. Within zone 3 specifically, it ranks 488th of 690 counties by estimated savings. Louisiana averages $906/year across the counties tracked here; Franklin Parish comes in 9% higher.
Where these numbers come from
Franklin Parish's climate figures — 2,194 heating and 2,570 cooling degree days a year — are read from WINNSBORO 2 SE, LA US, 2.1 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Franklin Parish 2567th nationally by total degree days — the 19th percentile. Franklin Parish falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
If Franklin Parish's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-38. That smaller top-up costs around $1,620 and saves an estimated $134/year — payback about 12.1 years. This one is a genuine toss-up, not a clear yes.
Getting it done in Franklin Parish
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $2,820 figure above as a planning number for Franklin Parish, not a bid - contractors typically charge a $600 minimum regardless of job size.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-49 is the target here specifically.